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using HyperBooru.ApiModels;
using System.Net;
using System.Net.Http.Json;

namespace HyperBooru.ApiClient;

public class HBSession : IDisposable {
    public Media      Media      { get; private init; }
    public Tag        Tag        { get; private init; }
    public Feed       Feed       { get; private init; }
    public User       User       { get; private init; }
    public Statistics Statistics { get; private init; }

    public bool HasNsfwClaim => false;

    public Uri BaseUri {
        get => HttpClient.BaseAddress!;
        set => HttpClient.BaseAddress = new($"{value.Scheme}://{value.Host}:{value.Port}/");
    }

    public bool SkipCertificateCheck {
        get => httpClientHandler.ClientCertificateOptions == ClientCertificateOption.Manual;
        set {
            if(value) {
                httpClientHandler.ClientCertificateOptions = ClientCertificateOption.Manual;
                httpClientHandler.ServerCertificateCustomValidationCallback =
                    (request, cert, certChain, policyErrors) => true;
            } else {
                httpClientHandler.ClientCertificateOptions = ClientCertificateOption.Automatic;
                httpClientHandler.ServerCertificateCustomValidationCallback = null;
            }
        }
    }

    internal HttpClient HttpClient { get; private init; }

    private HttpClientHandler httpClientHandler;

    private bool toDispose = true;

    public HBSession() {
        httpClientHandler = new() {
            AllowAutoRedirect = true,
            UseCookies        = true,
            CookieContainer   = new CookieContainer()
        };

        HttpClient = new(new ErrorHandler(httpClientHandler));

        Media      = new(this);
        Tag        = new(this);
        Feed       = new(this);
        User       = new(this);
        Statistics = new(this);
    }

    public HBSession(HttpClient httpClient) {
        HttpClient = httpClient;
        toDispose  = false;

        Media      = new(this);
        Tag        = new(this);
        Feed       = new(this);
        User       = new(this);
        Statistics = new(this);
    }

    public Task LoginAsync(string username, string password) =>
        Task.CompletedTask;

    public Task LogoutAsync() =>
        Task.CompletedTask;

    public void Dispose() {
        if(toDispose)
            HttpClient.Dispose();
    }
}

public class ErrorHandler : DelegatingHandler {
    public ErrorHandler(HttpMessageHandler innerHandler) : base(innerHandler) {}

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken ct) {
        var resp = await base.SendAsync(request, ct);

        if(resp.IsSuccessStatusCode)
            return resp;

        HBException e;
        try {
            e = await resp.Content.ReadFromJsonAsync<HBException>(ct) ??
                throw new NullReferenceException();
        } catch {
            throw new HBException("An unknown error occurred");
        }

        throw e;
    }
}